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CVE-2026-42899ASP.NET Core Denial of Service Vulnerability
- 7.5HighCVSS base score
- 2.4%Exploitation in 30 daysEPSS · top 16% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Loop with unreachable exit condition ('infinite loop') in ASP.NET Core allows an unauthorized attacker to deny service over a network.
Timeline
ID reserved
By microsoft
- 12 days later
· 12 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| microsoftCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C |
| redhat-SADPADP (enrichment) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 2.4% · top 16% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
Affected packages
Affected packages12
From reviewed advisories of the GitHub Advisory Database.
- NuGetMicrosoft.AspNetCore.App.Runtime.linux-armGHSA-9v76-4qcc-frgh (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.linux-arm64GHSA-9v76-4qcc-frgh (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.linux-musl-armGHSA-9v76-4qcc-frgh (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.linux-musl-arm64GHSA-9v76-4qcc-frgh (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.linux-musl-x64GHSA-9v76-4qcc-frgh (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.linux-x64GHSA-9v76-4qcc-frgh (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.osx-arm64GHSA-9v76-4qcc-frgh (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.osx-x64GHSA-9v76-4qcc-frgh (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.win-armGHSA-9v76-4qcc-frgh (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.win-arm64GHSA-9v76-4qcc-frgh (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.win-x64GHSA-9v76-4qcc-frgh (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.win-x86GHSA-9v76-4qcc-frgh (opens in a new tab)
References
References21
- ASP.NET Core Denial of Service Vulnerability (opens in a new tab)vendor-advisorypatch
- https://access.redhat.com/security/cve/CVE-2026-42899 (opens in a new tab)vdb-entryx_refsource_REDHAT
- RHBZ#2476605 (opens in a new tab)issue-trackingx_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42899.json (opens in a new tab)x_sadp-csaf-vex
- https://access.redhat.com/errata/RHSA-2026:24332 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:24333 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:22145 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:21286 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:21754 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:21295 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:21291 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:21294 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:24334 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:24335 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:24336 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:21297 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:21293 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:21296 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:17464 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:17682 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:17527 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-29719 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-9v76-4qcc-frgh (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-42899)Record last updated .